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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd569125def01452c67b1493582f7147c66de08342a01b118672efd46ba309a5e' 
  AND token = 'mDttai7ND2EFeM5j4Gz2lIzvVeli3Y2OK3FLDVNnClA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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