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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6cfd7567c7399f234f69062824d8537c989c2ba7f06ae0130cbca7a27c70087' 
  AND token = 'OVLRCsX79/RtdazXHLM7PGPN8xNEeAMxYz0KewJXB30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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