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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3110d954d38bb6723d5e5e07d134c2e8e72bab288fdaaf7a0d4cdfe070d3a9b9' 
  AND token = 'tPkbz4Qj4fhKBuk3glR7tNhqFP+QzUHwikfzWguSTI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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