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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700d00abd681b90c5274c7234091585f57b7c60004aa1d6d8419daa2cb11f9a0' 
  AND token = 'H+COjGdSDRaCKibCf90Tz/O+nb37VM6lbLcHegf0n30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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