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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd208ebf37b0621396b24f561d654b34678a300eb577e3ba5f7c71f7ad4771d' 
  AND token = 'lteA4PSC5xB17yGyew12sEQj+um8EnIhuoA1Cr2MDO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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