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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a8bb776643349c8cc799a5060e86d056ef20ad3c04c7f1771ea9e263a616391' 
  AND token = 'hde7iM4feyEoUwOnQ5CfKqCDd7ri3AL7BIZZHADw0Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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