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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f9404908ce58af01011c3199ed60dae21d0e9be703a9ad71af281a8c75da363' 
  AND token = 'LkpUTCDsLetgYo9pMhsAMXHIiKOI2llUWvWGeR5WR6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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