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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49571cc15cb32c092c09e7143a6bb34c1e10baf8cc4a361c19ae32ccf076b69c' 
  AND token = 'PAll+vjYE0v1JGV0IkALEibeNK+mKDUJP8igwG3kYS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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