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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e3d983c34eff7b767659bf2dfc36738f005d6e7792c03277db3d86f101ed69c' 
  AND token = 'JRlaZ1q/nePThkgOJ1QNe5Hannmq/B7hyqZv/QAik40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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