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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3df9624920397957ebfb59da7c75ca0015b59ff1ee2810c080f9122b87d50a5' 
  AND token = 'a55lZmdR+hv8pTg8snfaD+fxlSXTRC2nJsJSVsy3j/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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