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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e6275c443c02b3436a0b5638c9c3a0102a7c78884386793ebb1060c8835adee' 
  AND token = 'BjyPIerB8PjPNdaJJvhPo/pMDl377JlXoTUxbHY6+5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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