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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef6b2067bd52bb70d5eb4421e7f891951e10c58622f056f668da9abe5f9ea46f' 
  AND token = '9Qx2vpIm8PHBSLx782WYG6zpKHYFz83592Um5cQu2wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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