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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d0f03156d6e1cf47df03402ef9ab0fc958fce909d210c2720ae5a85ef52b85' 
  AND token = 'AR0SKtHO7wLEtMJm6sepef28jXN71SEs1951qWh9+DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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