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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e208035fe1c8b458ca9caa904fd22032835d580d2b1d59e6bc973ccb0a1c7ca9' 
  AND token = 'ZUH50l6B7snmXYpwHvtVYGU+sHahFe+Zouye16APQEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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