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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b1836f7e63ed1f9e1c56975210d77f96b6a3cab337249a6ecdf432936dc6a3' 
  AND token = '/lSnJ6d1S+Hmsm2urKmWbam8zUNljtJ0ZeIAMRoecu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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