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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70022477eb6697c0f03b60d667eab629967e1fe0d8a4cad62ec0bc9c1ccbc9e' 
  AND token = 'H5Y2Gl2uV0otDCzow40pfwAJlxypmv6Ch3bhnA0jz7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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