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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b576a259b93161de2bd8b92c2813a00717f919560fccbaf9d6d46a5f860e66e' 
  AND token = 'nPczl+luUBTElpRRzRubulvOSU0K0QF1Vop8pYd0FKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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