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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23fec9037b6ec708a13691ee0bbe1def27b96f3f0d4c60440e7bd1a2e3f67929' 
  AND token = 'xx0QfZXx6ugVE5G5ziDGKMn1pWn9QX0SQN7yWE8aRB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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