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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17987042f1a0e24039547b3c04e325251f5c8dfcb3363b9e22c7b424a1f2f34d' 
  AND token = 'eryJHIbuBUH53UlUFZuDyVyOWn8luSBjT59CUG7mdyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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