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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04fd0f046ce85cb6ee7f951d3ddf4c656830b0ac3417cc36cfcf24a9cfe97e3f' 
  AND token = 'T+gLSbJYjd+S/7R4SPJuXgQqp/f2lWFlOsPqc1f9RHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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