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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86357fb8631728e48585a65f6f1843107f4c0442f841716c06ee5aa70eafaf02' 
  AND token = 'lT9m3uL2Zm7YeKuIbiVqWX6NQUluL9MJRXSQuleeR70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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