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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c4a16bf5830d96b20c8f2e45cd4e018eb3b2a651d76f92e2ad0ed9125f05001' 
  AND token = 'v3X36ru8MQkWZgeRdnLdEgt3XreyGsR980AJ60Ae/lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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