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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '993a8cb0b0e551f18195e11a76c272a6e3e60c6bf8cfc1ea859e4abfd97c3871' 
  AND token = 'n+r4UQqtd8Fu4Q6IvPTbJwLjUJm0oeglmC+8rpteteE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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