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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6320d69f240cf5c1316746cae7b83c3c53b3f8a8c3ddb0a8a683ee3da25adc3a' 
  AND token = 'TnuN8YXFnwU4E5d+f3yMYLD/gydveM7gZDXAePnAf1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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