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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54820bb19bb37bb0b4a5f10445339e9d3563201753deaca4189be3e29cecfc50' 
  AND token = 'KO767qPE42dk1d+caaZ/ysgdABmtkdzIn0BqoagTOLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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