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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f44b5c90da0e8b9926fe612d512196682fbb69e74de9a791c076b3f5032170' 
  AND token = '91vJ08shT26iLh8XzrG+e8G97lOKIPz3ksM+Sy8CgKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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