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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd95edb9853d65f447863025e2dad19c6c3b1172e01c28f2f747ae4073aea6b' 
  AND token = '5YxqmIGO5EPQ4bWwPkx0/Qfs2faZTnpea6DnoICD91Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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