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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4df01fe12d71af43d128fb4b8a55518e9534c4b7f7e3061f337fd9436958598' 
  AND token = 'OLPh0xBcpsoOHl7r881B7fQHoOFd5DqYls4UK1qptZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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