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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b196d0da73bbbc5840f89ba9ebbb8f61e1772c047ce297094efb9c3254176c' 
  AND token = 'h9P+AlzVGoN9raauVR4jyhczJ/RHYoW1gZaeHSyDOIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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