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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0e31613db1319e000b00546822d77a8a2798d1aabff0018ad5014352fca4d8' 
  AND token = '4TPkKyEGBUrKWSfwjFiNrEVjP9y4puUoNeVn0cHjUGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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