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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3b1b6fb73b0dbc3069d63a7d5abbc3ea35af540bac6c6c36271b5c1a9281eb2' 
  AND token = 'kx2HoKLY4qModo659biHL9B+cGKLP6CC8eXkiYaLgu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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