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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f2c05f3a5ececb63c34a4cb65ce069fe8d521ef881ca96dcb723633a93fbfc' 
  AND token = 'T1qOHY25OwF/lBzF/bV9ElkJXW1G2rbeTvUUY5VC8rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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