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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4cd0e9a02a2b26c2f047b42fec023bcdca7f7cc61a8e3a96bc961f4e49234bc' 
  AND token = '+DbYQ15YPEftGqooLfblpvnvfAEfia/S0lOr9EOtUh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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