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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc1cc78e2c9bd395cd3120f71e21497d1ff05c8a8ffe731a9673b142805423e' 
  AND token = 'XKnjjKrCob/XIfwfifXqNvk1wapRR6oZ6ZLq//w6iLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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