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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b7e02d435cee8028b1375804d44258fe478ecd275346a351c3c9d4730b280c' 
  AND token = 'leaSsFddbk+dE11raqHATnrvtrS7kJR7CgkZ3Q2uQpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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