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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f4cb8c644a67dcf13f96176cb9277055cdaaa3ac593261993d2454a13271f76' 
  AND token = 'Sz2yByr60sBuhPtBSQUxlqaiGQwOZvVxEH3ldkNc8y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}