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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a932e20495e7776fd0d911c6e236d5215a85146d5eca6a1b489fa1af809b4802' 
  AND token = 'I2B55xgqTQdIJGe3o5qcvtsqzJpTpQ6JqBhXeGmD93E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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