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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b559549f031d6661370f8a9d57edf234cf11b3e15a44f6a4e2be5c33128fd02c' 
  AND token = '86TNJy0GaY/Z1xD/u0GG3tRB2H6NacMedtnr5E+futY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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