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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e08b4b2382120523d6845a91c6503b6803bf710b166511241921b2a6c520935f' 
  AND token = '/g2TMN/yNv4c7qzNMnvS/7oyB2GRce3c1UdIRH0/FTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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