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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a7678a500d2949f1eb25ca085829bea73e4d42a941721447cc859fc77ed403' 
  AND token = '3FHOfNPFWIJn61ft6X2yl88mQy+Eqh5JjZKzQBtUA9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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