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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c38f8f992fad30d8f1f4fbf5d89d8c82c03d831ce5711c40618e0896d560a6' 
  AND token = 'taKPNFVbPM3YMRJg8A0RgOmQLHICs9dDfVjdmUt/9gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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