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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03214318b9816276337d1c9b94ddf969334da65cad710605817b245d9dc5b5d' 
  AND token = '9+HL0Wj0E2igtMe4IQRTCPMMDchktYIRjeWYtpJxISQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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