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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff8cf890f462b8e3a21429eef3f95f19388591e6d6e52db186a7cfe1192f95a' 
  AND token = '4eNCz7ihyM6cSkJVa9eN4vGKozh2eaztxGyTAoNtKHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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