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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd07a75e608ed910eb2a02e9966bfb36536d2b0c6ddf473efe10c8796d9f3f064' 
  AND token = 'rlokLyfeycQt+XUugvgRtdmN7yyM0BxYvdP++t9L7oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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