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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564d794330aa3b08cb734e7a33b923cb0852a6de652bce6055b3ac3f539ba108' 
  AND token = 'omToa+1aXJeCuIM0LEFNUPJfIL5zzzSp9lVy/BhpOG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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