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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9032620594a143cbf175f9afab58d565b97de68fbd174ccd6fd28286cec55000' 
  AND token = '0Qy8tfgF09tfUEIcHPSczzlDF0LcRPiSUfWNkdfz2pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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