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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a637505aa76d3646bcccffb9fd36cfabb9d46a73c9c4cd4b446c397818cf7bb4' 
  AND token = 'J0ph6wjlmXEaHCbVW0uwFFrh7rbs/40tlSTnge/vh0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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