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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3656223e29bb9661c31014d1ca9d05471f2d34fe29fa117ca0a14b46e3f557da' 
  AND token = '+RHghRV9AOVNieq0DuJLBHZPhQ8WS5B0GLMEN2gbESM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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