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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ad7daf21b06dae8ad1214e631890bfab9dd09decb744620f43bc98827d92e50' 
  AND token = '0+90UB3dqlCFMgQBDLlYeowTE5VKig5xrZ1lwcHqlXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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