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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e240ebf358c193dc591abbab939f52bec6175f0ac306bf75a5624637ec53bb54' 
  AND token = '5aYIBpm/CpVC1HuNJdekyQ3scQead5F4vY2h8PclPdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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