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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eab149ee001743d2aa409ddf2e22fe1ad462b015cdd74a07a70233c463700f0' 
  AND token = 'f9kJE/ITrPr+84L+d89S31esiIUh8O7xUCmOV6RxwAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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